Scans your Obsidian vault for concepts that show up together frequently across pages but have no dedicated synthesis page connecting them, then creates new pages in synthesis/ that draw explicit cross-cutting conclusions. It builds a co-occurrence matrix by grepping for wikilinks, scores candidates based on frequency and cross-domain overlap, and generates pages titled "Concept A × Concept B" with the insight that only becomes visible when you look at both together. Run it when you say "synthesize my wiki" or after a large ingest when the vault has grown enough that patterns are emerging but connections aren't explicit yet. The real discipline here is that synthesis pages must add something neither source says alone, otherwise you're just making noise.
npx skills add https://github.com/ar9av/obsidian-wiki --skill wiki-synthesize